Warning: This application note illustrates a typical strain gage application and is not for actual medical use.

One use of Center of Pressure
measurement is in the study of standing posture - Posturography. By measuring the
position of the Center of Pressure at regular intervals, a plot
called a spaghetti diagram can be generated. By calculating the mean
and standard deviation of the center of pressure, an indication of
sway is derived1.

In the paper Context Acquisition
Based on Load Sensing2, an algorithm is given to
measure the center of pressure using four load cells. If the total
force exerted at x,y by the load is FL and assuming
static forces, the sum of all 4 load cells F1, F2,
F3, and F4 is equal to FL as given
by eq 1

Similarly, the no load force F0L
is the sum of the forces on each load cell F01, F02,
F03, and F04 - eq 2. The position of the load
can be calculated by eq 3 and 4 using the load and no load forces.

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